global: Use proper project name U-Boot

Use proper project name in comments, Kconfig, readmes.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/0dbdf0432405c1c38ffca55703b6737a48219e79.1684307818.git.michal.simek@amd.com
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 7b64532..572cef1 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -9,7 +9,7 @@
  * Author: Robert Marko <robert.marko@sartura.hr>
  * Author: Luka Kovacic <luka.kovacic@sartura.hr>
  *
- * Based on stock U-boot and Linux drivers
+ * Based on stock U-Boot and Linux drivers
  */
 
 #include <asm/gpio.h>